usb: dwc3: Endianness issue on dwc3_log_ctrl

Sparse complains even though it looks ok. Probably it cannot detect that
the wValue, wIndex, and wLength are declared __le16 due to the macro
magic.

Redeclare them as CPU endianness and make the conversion on assignment.

Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>